// Wild Magic Source Code
// David Eberly
// http://www.geometrictools.com
// Copyright (c) 1998-2009
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or (at
// your option) any later version.  The license is available for reading at
// either of the locations:
//     http://www.gnu.org/copyleft/lgpl.html
//     http://www.geometrictools.com/License/WildMagicLicense.pdf
//
// Version: 4.0.0 (2006/06/28)

#include "Wm4FoundationPCH.h"
#include "Wm4OdeEuler.h"

namespace Wm4
{
//----------------------------------------------------------------------------
template <class Real>
OdeEuler<Real>::OdeEuler (int iDim, Real fStep,
    typename OdeSolver<Real>::Function oFunction, void* pvData)
    :
    OdeSolver<Real>(iDim,fStep,oFunction,pvData)
{
}
//----------------------------------------------------------------------------
template <class Real>
OdeEuler<Real>::~OdeEuler ()
{
}
//----------------------------------------------------------------------------
template <class Real>
void OdeEuler<Real>::Update (Real fTIn, Real* afXIn, Real& rfTOut,
    Real* afXOut)
{
    m_oFunction(fTIn,afXIn,m_pvData,m_afFValue);
    for (int i = 0; i < m_iDim; i++)
    {
        afXOut[i] = afXIn[i] + m_fStep*m_afFValue[i];
    }

    rfTOut = fTIn + m_fStep;
}
//----------------------------------------------------------------------------
template <class Real>
void OdeEuler<Real>::SetStepSize (Real fStep)
{
    m_fStep = fStep;
}
//----------------------------------------------------------------------------

//----------------------------------------------------------------------------
// explicit instantiation
//----------------------------------------------------------------------------
template WM4_FOUNDATION_ITEM
class OdeEuler<float>;

template WM4_FOUNDATION_ITEM
class OdeEuler<double>;
//----------------------------------------------------------------------------
}
